programs/ln007/subpoly1.java
import java.util.*;
import java.util.Vector;

class Shape {
}

class Circle extends Shape {
}

class Square extends Shape {
}

class Main {
   public static void main(String[] args) {
		Shape s1 = new Circle();
		Shape s2 = new Square();
		Circle c = new Shape();
		Square sq = new Shape();	
    }
}


